Portion of a golf club head



The sole FIGURE is a front elevational view of a portion of a golf club head, embodying the inventive design.

The shading represents three different surface treatments. The broken lines immediately adjacent the shaded areas represent the bounds of the claimed design, while all other broken lines are directed to environment and are for illustrative purposes only; the broken lines form no part of the claimed design. 

The ornamental design for a portion of a golf club head, as shown and described. 